Webzen Korea has just announced their newest game, MU Online: Blue. Reports did not mention if its an expansion or totally new game, but if I remembered correctly, the updates to MU Online are known as Seasons, with the current Korean MU Online at Season 5. An entirely new game ? We shall see. In initial reports, the game will introduce a new and enhanced PvP leveling system and add in more PvPvE maps. Stay tuned as more information is released.
Official teaser website: http://blue.muonline.co.kr/